Question

Three corners of a square have charges + 1, - 2, + 5 is to what charge should be placed on the fourth corner so that the potential at the centre of the square is zero----
1) -4 esu
2) +3 esu
3) +4 esu
4) -3 esu

please give explaination along with the answer....if you can't explain then don't answer it....​

Answer 1

1) -4 esu

To make electric potential zero we need net charge of the system to me zero as the distance is same from all the points